This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X336S, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SI40 Standard Cylinder SI40X336S
The AirTAC SI40 Standard Cylinder SI40X336S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 336mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X336S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke336 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X336S
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SI40 Standard Cylinder SI40X336S
The AirTAC SI40X336S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 336mm stroke. It delivers 628N push force at 0.5MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI40X336S, a direct upgrade sharing the exact ISO 15552 mounting interface, bore, stroke, output force, and port size.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. For applications needing load holding on air loss, the new SAI family includes SAIL and BSAI lock variants the SI lacked. This -S model includes a piston magnet for CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40X336S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X336S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X336S |
| Bore size | Ø40 mm |
| Stroke | 336 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 27 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI40X336S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
The SAI40X336S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI40 Standard Cylinder SI40X336S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×336 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SI40 Standard Cylinder SI40X336S Is Used
Package Diverting
Pushes cartons on packaging lines using the 628N push force at 0.5MPa, with the 336mm stroke clearing conveyor frames.
Component Ejection
Ejects molded parts from fixtures, where the adjustable 27mm air cushions soften end-of-stroke impact.
Replacing the Airtac SI40 Standard Cylinder SI40X336S with the SAI40X336S
To replace the SI40X336S, order the SAI40X336S direct equivalent, confirming the ISO 15552 interface, 40mm bore, 336mm stroke, G1/4 port, and mounting accessory. The -S suffix indicates a magnet for CS1-B/DS1-B switches; the SAI uses current AirTAC switches. Sizing both ways: the 40mm bore yields 628N push at 0.5MPa, while the neighboring 50mm bore offers 982N. Note that a plain cylinder drifts without live air; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. Because the 336mm stroke exceeds 300mm, add external guides to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X336S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI40 Standard Cylinder SI40X336S FAQ
Yes, the SI40X336S is discontinued. The direct replacement is the SAI40X336S. It shares the same ISO 15552 mounting interface, 40mm bore, 336mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly.
The 40mm bore uses a G1/4 port. Theoretical forces are: 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a maximum force of 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X336S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X336S replacement — usually within 7-8 hours.